Microeconomic Objectives, Market Failure & Government Intervention – Comprehensive Notes

Scarcity inherently leads to the price mechanism, which serves signalling, incentive, and rationing functions. A key question is whether allocative efficiency (AE) is achieved, meaning if the equilibrium $Q_{mkt}$ maximizes social welfare. While free-market advocates champion the market, its limits often necessitate potential government roles. The extent of intervention must be carefully weighed due to the risk of unintended outcomes.

Perfectly competitive (PC) market assumptions include many buyers and sellers, homogeneous products, free entry and exit, perfect information, perfect factor mobility, and no externalities. Under these ideal conditions, $MPB = MSB$ and $MPC = MSC$, leading to allocative efficiency. Under-production (where MSB > MSC between $Q<em>1$ and $Q</em>s$) and over-production (where MSC > MSB beyond $Q<em>s$ to $Q</em>2$) result in dead-weight loss areas, specifically $CDE$ and $EFG$ respectively. The social optimum is achieved where $MSB = MSC$ at point E. Government micro-targets primarily encompass Allocative Efficiency and Equity, with Productive and Dynamic efficiency being addressed elsewhere.

Allocative efficiency may fail in reality due to non-PC market structures or self-interest, leading to mis-allocation or even 'missing' goods. The notion of equity concerns fair access to necessities, especially for low-income individuals who might be excluded, prompting government intervention. Market failure is broadly defined by the failure of PC assumptions. A teaching device, FIRST, is used for policy evaluation: Feasibility/Flexibility, Impediments (info gaps, offsetting factors), Root-cause targeting, Side-effects / unintended consequences, and Time period / timeliness.

Public Goods

Public goods are characterized by being non-rival, non-excludable, and non-rejectable, such as national defense, in contrast to private goods like an HDB flat. Non-rivalry implies that the marginal cost ($MC$) for an additional user equals zero. Due to the free-rider problem, there is no effective demand for public goods, leading to a missing market where $Q_p = 0$. Profit-maximizing firms will not supply goods at a price of zero, resulting in a complete market failure and welfare loss. However, technological progress, as seen in the lighthouse thought experiment, can sometimes convert public goods into quasi-public goods, emphasizing the need for careful classification.

Government Remedies for Public Goods:

1. Direct Provision: The government directly provides public goods, such as funding the army or building flood barriers. This approach ensures supply where the market fails. The H-A-L evaluation table assesses these policies by considering advantages like flexibility and potential productive efficiency when private contractors are involved. However, limits include imperfect information on optimal quantity supplied ($Q_s$), budget constraints, and potential productive inefficiency within the public sector.
2. Joint Provision / Subsidy to Private Producers: The government can subsidize private producers for activities like basic research, encouraging them to supply goods that have public good characteristics.

Externalities

Externalities are classified into positive or negative, arising from either production or consumption. Key definitions include Marginal External Cost ($MEC$), Marginal Private Cost ($MPC$), Marginal Social Cost ($MSC$), Marginal External Benefit ($MEB$), Marginal Private Benefit ($MPB$), and Marginal Social Benefit ($MSB$). Figure 1a serves as the baseline for demonstrating allocative efficiency in the absence of externalities.

Positive Externalities: In cases like Research & Development (R&D) (positive externality in production) or vaccines (positive externality in consumption), the Marginal Social Benefit ($MSB$) exceeds the Marginal Private Benefit ($MPB$), leading to under-production or under-consumption, respectively. This results in a deadweight loss, often represented by the area $triangle ABC$

Policies for Positive Externalities:

1. Subsidy: A subsidy can be set equal to the Marginal External Benefit ($MEB$) to shift the Marginal Private Cost ($MPC$) or $MPC<em>{consumer}$ curves, encouraging production or consumption to reach the socially optimal quantity ($Q</em>s$). The effectiveness depends on the government's ability to accurately estimate the $MEB$ and the elasticity of demand/supply.
2. Direct/Free Provision: When the $MEB$ is substantial, or there are significant information gaps and equity concerns, direct or free provision of the good (e.g., NCIS vaccines in Singapore) is justified. Advantages include ensuring equity and quality control, while disadvantages include high costs and potential productive inefficiencies.
3. Regulation: Compulsory education or vaccination laws can be implemented to mandate consumption, internalizing the positive externality. Their effectiveness depends on monitoring costs and enforcement.
4. Public Education: This softer policy involves educating the public to 'nudge' behavior towards greater consumption of goods with positive externalities. However, it often has a long lag time before showing significant effects (e.g., RIE2025 $\$25\,bn$).

Negative Externalities: For instances like coal power (negative externality in production) or cigarettes (negative externality in consumption), the Marginal Social Cost ($MSC$) exceeds the Marginal Private Cost ($MPC$), leading to over-production or over-consumption. The government employs various tools to address these issues.

Policies for Negative Externalities:

1. Pigovian Tax: A tax equal to the Marginal External Cost at the socially optimal quantity ($MEC(Q_s)$) can be levied. Its effectiveness is contingent on the Price Elasticity of Demand (PED) and the accuracy of information regarding external costs. A less elastic demand means the tax will be less effective in reducing quantity.
2. Regulation/Quota/Ban: Regulations, such as emission standards or the Vehicle Quota System, set limits on production or consumption. A complete ban is only efficient if the Marginal Social Cost ($MSC$) always exceeds the Marginal Social Benefit ($MSB$) for all quantities produced.
3. Tradable Permits (Cap-and-Trade): This market-based approach, exemplified by the EU Emissions Trading System (EU ETS), sets a cap on total emissions and allows firms to buy and sell permits. Firms can choose the cheapest path: abate pollution or buy permits. While efficient, it can lead to pollution 'hot-spots', incur administrative costs, and involve political considerations in permit allocation. A comparison between carbon taxes and cap-and-trade systems is also relevant here.
4. Education: Similar to positive externalities, public education can be used to discourage consumption of goods with negative externalities, although it generally requires a long time to see effects.

Information Failure

Information failure occurs when imperfect information leads to a divergence between perceived Marginal Private Benefit ($MPB$)/Marginal Private Cost ($MPC$) and their actual values. Under-estimation of MPB (e.g., cancer screening) leads to under-consumption, while under-estimation of MPC (e.g., due to cigarette ads) leads to over-consumption. Cognitive biases and information avoidance also influence policy effectiveness.

Policies for Imperfect Information:

1. Legislation: Mandatory labels, bans on misleading advertisements, and other regulatory measures can improve information availability and accuracy.
2. Public Education: Agencies like the Health Promotion Board (HPB) issue advisories (e.g., haze advisories) to inform the public and correct misperceptions.
3. Conditional Subsidies/Taxes: Similar to externality solutions, these can be used to incentivize or disincentivize consumption based on corrected information.

Asymmetric Information: This arises when one party in a transaction has more or better information than the other, creating issues like adverse selection ('lemons' problem) and moral hazard (hidden action). In the used-car market, sellers are more informed; solutions include the Lemon Law, warranties, and building a strong reputation. In insurance markets, buyers are more informed; solutions involve compulsory national schemes (e.g., MediShield Life), screening medicals, and the use of co-payment and deductibles. The principal-agent problem in healthcare, such as physician-induced demand, is also a form of moral hazard. Governments use legislation (e.g., co-pay caps) to curb moral hazard. The Annex also details private-sector signaling and screening mechanisms to mitigate asymmetric information, such as warranties, third-party certifications (SAFETY Mark), reputation systems, and insurance screening medicals, emphasizing that these signals must be credible and cost-differentiated.

Factor Immobility

Factor immobility can be occupational or geographical, affecting both labor and capital. It leads to unemployment, production inside the Production Possibilities Curve (PPC), and deadweight loss.

Policies for Factor Immobility:

1. Retraining and Up-skilling: Initiatives like SkillsFuture and Continuing Education and Training (CET) programs aim to enhance the occupational mobility of labor.
2. Job-matching Services: Government agencies facilitate connections between job seekers and employers to reduce search frictions.
3. Grants and Subsidies: Startup SG provides grants to new businesses, while Productive Solutions Grant (PSG) or similar schemes subsidize capital adoption to improve capital mobility.
4. Infrastructure Development: Investments in better transport and housing (e.g., High-Speed Rail, Punggol Digital District) can improve geographical mobility of labor and capital.

Evaluation of these policies considers their high cost, time lags for effects to materialize, and the opportunity costs of resources expended.

Inequity

Equity is distinct from efficiency and is often rooted in income inequality and market power. The Gini coefficient measures income inequality, which is influenced by factors like the tech-skill premium, globalization, and wealth concentration. Essential goods often have price-inelastic demand, exacerbating affordability issues for low-income households.

Policies for Inequity:

1. Affordability Measures: Price ceilings (e.g., rent control) and indirect subsidies can make essential goods more accessible.
2. Reducing Income Gap:
   • Human-Capital Investment: Long-term investments from pre-school to SkillsFuture aim to enhance earning potential.
   • Progressive Taxes: Tax systems with higher rates for higher incomes (e.g., Singapore resident tax brackets up to $24\%$) redistribute wealth.
   • Transfers: Direct financial assistance or vouchers (e.g., ComCare, Workfare Income Supplement (WIS), CDC vouchers) provide immediate support, reducing the post-tax Gini coefficient (e.g., to 0.371).
   • Minimum Wage: While designed to boost low incomes, a minimum wage can result in debates over its effects on unemployment and prices.

Government Failure

Intervention, despite its good intentions, can sometimes worsen outcomes, leading to government failure. This can be attributed to information gaps, time lags in policy implementation, high administrative costs, rent-seeking behavior by special interest groups, and political myopia (short-sighted policy decisions). Therefore, decisions on intervention require careful consideration, weighing the deadweight loss before intervention against the potential deadweight loss after intervention ($DWL<em>{before}$ vs. $DWL</em>{after}$).

Key Takeaways

1. Self-interest can lead to mis-allocation of resources.
2. The six sources of market failure are public goods, externalities, information failure, factor immobility, and market dominance.
3. Governments intervene for efficiency and/or equity, but the form and extent of intervention are complex.
4. Poorly-designed policies can themselves lead to government failure.

Annex

Private-sector mechanisms to mitigate asymmetric information include warranties, third-party certification (e